Yes, it is. It is the symbol for Helium. It has an atomic number of 2. Helium is the second most abundant element in the universe. Another fact that is very interesting is: 'At temperatures close to absolute zero helium condenses to a liquid with amazing properties – the properties of a superfluid, flowing with zero friction up and over the walls of containers'.
ClO4- Note that this is not an "element" and hence doesn't have an "element symbol."
The symbol of helium is he
There is no element with symbol a or A even
The chemical symbol for the element Xenon is Xe.
Take the element "Iron" then the symbol for the element is "Fe" and "Fe" is also the symbol for a single atom of the element in a chemical equation.
O is the the symbol of the element oxygen.
B is the symbol for which element?Boron
The symbol for the element Terbium is Tb
The element symbol for barium is Ba.
If you meant "element" as in a chemical element, there is no element with the symbol "ef" in the periodic table.
Potassium, with an Atomic Number of 19, is designated by the symbol 'K'.
The atomic number of the element with the symbol Be (Beryllium) is 4.